Acer 670 4.3. Detailed Circuit Theory

4-4Theory of Operation

4.2.8.1 AC Power Adapter

The computer is equipped with a universal AC power adapter that converts AC voltage into DC

voltage (approx. 46 Watts of power) used to operate the notebook and charge the batteries. The

specifications for the AC adapter include:

• Input Voltage: 100 to 250 VAC

• Input Current: Approximately 1.5 Amps

• Input Frequency: 50 to 60 Hz

4.3. Detailed Circuit Theory

The remainder of this chapter provides chip-level circuit description for the Extensa Series

Notebooks.

4.3.1 Major Components

Table 4-1 shows a listing the of the major components used in the Extensa Series Notebooks.

Table 4-1 Major Chips List

Component Vendor Description

M1521 Acer PCI, cache and memory controller (Host-PCI

Bridge)

M1523 Acer System controller chip (PCI-ISA Bridge)

M6377 Acer Power management controller

65550 C&T (Chips & Technology) Video controller

TI1130 Texas Instruments PCMCIA controller

NS87336VJG NS (National Semiconductor) Super I/O controller

ES1878 ESS Technology Audio controller

T62.045.C.00 Ambit Charger board

DAC-07B008 Delta LCD inverter

DC-R05 Delta LCD ID board

M38802 Phoenix Keyboard encoder and decoder

Contents

Main CopyrightCopyright DisclaimerDisclaimer About this ManualAbout this Manual Purpose Manual Structure Related product information Conventions a, e, s, etc. Represent the actual keys that you have to press on the Table of ContentsTable of Contents Chapter 1 General Introduction Chapter 2 Installation Chapter 3 Operating Instructions Chapter 4 Theory of Operation Chapter 5 Troubleshooting Procedures Chapter 6 Field Service Appendix A Maintenance Data List of FiguresList of Figures Page List of TablesList of Tables Page 1-2General Description 1.2. Notebook Model Number Definition The following figure contains a summary of the available models in the 67x Series. 1.3. Product Overview Page 1.3.1 Video Display Features 1.3.2 Software Features 1.3.3 67x Series External Ports 1.3.4 Standard Peripheral Devices 1.3.5 Expansion Capabilities 1.3.6 PCMCIA Card Options Page 1.4. Standard Test Features 1.4.1 Power On Self Test 1-10 General Description 1.5. Extensa 67x Series Specifications Service Guide 1-11 Table 1-5 Specifications Characteristic Model 670 Page C h a p t e r 2C h a p t e r 2 Installation 2.3. Installing Internal Notebook Options 2.3.1 Installing Main Memory Expansion (Optional) 2.3.2 Setting up the Software 2.4. Installing External Options 2.4.1 Installing PCMCIA Options Page Page Page 2.5.4 Installing an External VGA Monitor 2.5.5 Installing the Security Lock Option 2.6. Battery Pack Installation 2.7. Installing the AC Power Adapter 2.8. Initial System Checkout 2.9. Making Backups of System Software &KDSWHU Operating Instructions 3.1. Introduction 3.2. Controls/Indicators 3-2 Operating Instructions Indicator Light Description Table 3-2 Summary of Notebook Hot Key Sequences Function Key Sequence Service Guide 3-3 Table 3-2 Summary of Notebook Hot Key Sequences Function Key Sequence C h a p t e r 4C h a p t e r 4 Theory of Operation 4.2.2 Memory Subsystem 4.2.3 Video Subsystem 4.2.4 Sound Subsystem 4.2.5 Keyboard Subsystem 4.2.6 Hard Disk Drive Subsystem 4.2.7 Floppy Disk Drive Subsystem 4.2.8 Power Subsystem 4.3. Detailed Circuit Theory 4.3.1 Major Components 4.3.2 System Architecture 586 CPU 4.3.3 ALI M1521 (PCI, Cache and Memory Controller) Page 4-8Theory of Operation 4.3.4 ALI M1523 (PCI, Cache and Memory Controller) Figure 4-3 M1523 Chip Simplified Block Diagram M1523 Block Diagram Service Guide 4-9 ALi Figure 4-4 M1523 Chip Pinouts M1523 Page Page Page 4.3.6 C&T 65550 High Performance Flat Panel / CRT VGA Controller Page Page 4.3.7 TI1130 PCMCIA Controller Page Page 4.3.8 NS87336VJG Super I/O Controller Page 4-22 Theory of Operation A simplified block diagram of the Super I/O controller is provided in Figure 4-13. Figure 4-13 NS87336VJG Chip Simplified Block Diagram Service Guide 4-23 4.3.9 ESS1878 Audio Controller with Interface to Expansion Audio Mixer with corresponding pins of ES978 in expansion unit C h a p t e r 5C h a p t e r 5 Troubleshooting Procedures Page 5.3.3 Fault Isolation Using Self Test 5-4Troubleshooting Procedures Table 5-2 Self Test Error Messages Error Message Explanation Page 5-6Troubleshooting Procedures Table 5-3 Self Test Beep Messages Beep Code Port 80h Description Page C h a p t e r 6C h a p t e r 6 Field Service Page Page 6.5.1 Removing/Replacing the Notebook Battery Pack Page 6.5.3 Removing/Replacing the Hard Disk Drive Assembly 6.5.4 Removing/Replacing the Keyboard Assembly 6.5.5 Removing/Replacing Expansion Memory Page 6.5.7 Removing/Replacing the CPU Chip Page 6.5.9 Removing/Replacing the Display Assembly 10 Removing/Replacing the Top Cover 6.5.11 Removing/Replacing FIR/Audio Board 6.5.12 Removing/Replacing the Fan Assembly 6.5.13 Removing/Replacing the LED Board 6.5.14 Removing/Replacing Inside Frame Assy Page Page Page Page 6.5.19 Removing/Replacing the Touchpad Assembly 6.5.20 Removing/Replacing the Display Bezel 6.5.21 Removing/Replacing the LCD Inverter and LCD ID Boards 6.5.22 Removing/Replacing the LCD Panel A p A p p e n d p e n d i x Ai x A Maintenance Data A.3.1 Cover-Display Assembly LCD ID Board LCD Inverter A.3.2 System Base Assembly A-4Maintenance Data Service Guide A-5 Page Service Guide A-7 A.4. Jumper Options Figure A- 4Main Board Jumper Options (top side) The remainder of this appendix describes the jumper configuration options for the 670 Series boards. A-8Maintenance Data Figure A-5Main Board Jumper Options (bottom side)